mine did the exact same thing when i bought it, it cut out on me goind round a bend at 50, wasnt usefull when i came to put my brakes on after the bend and turn into my road, its never done it since but think it could of been the spark plugs like said above, maybe a new set of plugs and leads will sort that out for you, and as with the juddering, deffo sounds like your balancing however depending on what alloys you have you will get roubbed if u got centre less alloys, hope any of this helps
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